Step 1: Identify the sensors on the IRS-1C satellite.
The Indian Remote Sensing program's IRS-1C satellite was equipped with three primary imaging sensors:
1. Panchromatic Camera (PAN)
2. Linear Imaging Self-Scanning Sensor (LISS-III)
3. Wide Field Sensor (WiFS)
Step 2: Determine the number of spectral bands for the primary multispectral sensor.
The LISS-III is considered the primary operational multispectral sensor. It captures data in four spectral bands:
- Band 2: Green (0.52 - 0.59 \(\mu\)m)
- Band 3: Red (0.62 - 0.68 \(\mu\)m)
- Band 4: Near-Infrared (NIR) (0.77 - 0.86 \(\mu\)m)
- Band 5: Short-Wave Infrared (SWIR) (1.55 - 1.70 \(\mu\)m)
In contrast, the PAN sensor operates in a single panchromatic band, and the WiFS sensor uses two bands (Red and NIR). Therefore, the LISS-III sensor's band count is the most relevant to the question.